Every year, at the edge of a valley, Alliaé and her grandfather walk to a waterfall to cool off. But this year, the water no longer flows, only a few drops trickle against the rock. The young girl then goes on a quest to solve the mystery and decides to trace the origins of the no-longer-flowing spring. Her epic journey will take her on the path of various animals that will allow her to better understand the water cycle...
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Vsako leto se na robu doline Alliaé skupaj s svojim dedkom odpravi do slapa, da bi se ohladila. A letos voda ne teče več – le nekaj kapljic še curlja po skali. Mlado dekle se tako odpravi na pot, da bi razvozlala skrivnost, in se odloči poiskati izvir, ki je prenehal teči. Njeno epsko potovanje jo popelje po sledeh različnih živali, ki ji pomagajo bolje razumeti krogotok vode...